<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Daytime.7 - A combined TCP/UDP asynchronous server</title>
    <link rel="stylesheet" href="../../boostbook.css" type="text/css">
    <meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
    <link rel="home" href="../../index.html" title="Asio">
    <link rel="up" href="../tutorial.html" title="Tutorial">
    <link rel="prev" href="tutdaytime6/src.html" title="Source listing for Daytime.6">
    <link rel="next" href="tutdaytime7/src.html" title="Source listing for Daytime.7">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%">
    <tr>
        <td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td>
    </tr>
</table>
<hr>
<div class="spirit-nav">
    <a accesskey="p" href="tutdaytime6/src.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u"
                                                                                             href="../tutorial.html"><img
        src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png"
                                                                                      alt="Home"></a><a accesskey="n"
                                                                                                        href="tutdaytime7/src.html"><img
        src="../../next.png" alt="Next"></a>
</div>
<div class="section">
    <div class="titlepage">
        <div>
            <div><h3 class="title">
                <a name="asio.tutorial.tutdaytime7"></a><a class="link" href="tutdaytime7.html"
                                                           title="Daytime.7 - A combined TCP/UDP asynchronous server">Daytime.7
                - A combined TCP/UDP
                asynchronous server</a>
            </h3></div>
        </div>
    </div>
    <p>
        This tutorial program shows how to combine the two asynchronous servers that
        we have just written, into a single server application.
    </p>
    <h5>
        <a name="asio.tutorial.tutdaytime7.h0"></a>
        <span><a name="asio.tutorial.tutdaytime7.the_main___function"></a></span><a class="link"
                                                                                    href="tutdaytime7.html#asio.tutorial.tutdaytime7.the_main___function">The
        main() function</a>
    </h5>
    <pre class="programlisting"><span class="keyword">int</span> <span class="identifier">main</span><span
            class="special">()</span>
<span class="special">{</span>
  <span class="keyword">try</span>
  <span class="special">{</span>
    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span> <span
                class="identifier">io_context</span><span class="special">;</span>
</pre>
    <p>
        We will begin by creating a server object to accept a TCP client connection.
    </p>
    <pre class="programlisting">    <span class="identifier">tcp_server</span> <span
            class="identifier">server1</span><span class="special">(</span><span
            class="identifier">io_context</span><span class="special">);</span>
</pre>
    <p>
        We also need a server object to accept a UDP client request.
    </p>
    <pre class="programlisting">    <span class="identifier">udp_server</span> <span
            class="identifier">server2</span><span class="special">(</span><span
            class="identifier">io_context</span><span class="special">);</span>
</pre>
    <p>
        We have created two lots of work for the <a class="link" href="../reference/io_context.html" title="io_context">io_context</a>
        object to do.
    </p>
    <pre class="programlisting">    <span class="identifier">io_context</span><span class="special">.</span><span
            class="identifier">run</span><span class="special">();</span>
  <span class="special">}</span>
  <span class="keyword">catch</span> <span class="special">(</span><span class="identifier">std</span><span
                class="special">::</span><span class="identifier">exception</span><span
                class="special">&amp;</span> <span class="identifier">e</span><span class="special">)</span>
  <span class="special">{</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cerr</span> <span
                class="special">&lt;&lt;</span> <span class="identifier">e</span><span class="special">.</span><span
                class="identifier">what</span><span class="special">()</span> <span
                class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span
                class="identifier">endl</span><span class="special">;</span>
  <span class="special">}</span>

  <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
<span class="special">}</span>
</pre>
    <h5>
        <a name="asio.tutorial.tutdaytime7.h1"></a>
        <span><a name="asio.tutorial.tutdaytime7.the_tcp_connection_and_tcp_server_classes"></a></span><a class="link"
                                                                                                          href="tutdaytime7.html#asio.tutorial.tutdaytime7.the_tcp_connection_and_tcp_server_classes">The
        tcp_connection and tcp_server classes</a>
    </h5>
    <p>
        The following two classes are taken from <a class="link" href="tutdaytime3.html"
                                                    title="Daytime.3 - An asynchronous TCP daytime server">Daytime.3</a>.
    </p>
    <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">tcp_connection</span>
  <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span
                class="special">::</span><span class="identifier">enable_shared_from_this</span><span class="special">&lt;</span><span
                class="identifier">tcp_connection</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span
                class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">tcp_connection</span><span
                class="special">&gt;</span> <span class="identifier">pointer</span><span class="special">;</span>

  <span class="keyword">static</span> <span class="identifier">pointer</span> <span
                class="identifier">create</span><span class="special">(</span><span class="identifier">asio</span><span
                class="special">::</span><span class="identifier">io_context</span><span
                class="special">&amp;</span> <span class="identifier">io_context</span><span class="special">)</span>
  <span class="special">{</span>
    <span class="keyword">return</span> <span class="identifier">pointer</span><span class="special">(</span><span
                class="keyword">new</span> <span class="identifier">tcp_connection</span><span
                class="special">(</span><span class="identifier">io_context</span><span class="special">));</span>
  <span class="special">}</span>

  <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span
                class="special">&amp;</span> <span class="identifier">socket</span><span class="special">()</span>
  <span class="special">{</span>
    <span class="keyword">return</span> <span class="identifier">socket_</span><span class="special">;</span>
  <span class="special">}</span>

  <span class="keyword">void</span> <span class="identifier">start</span><span class="special">()</span>
  <span class="special">{</span>
    <span class="identifier">message_</span> <span class="special">=</span> <span
                class="identifier">make_daytime_string</span><span class="special">();</span>

    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_write</span><span
                class="special">(</span><span class="identifier">socket_</span><span class="special">,</span> <span
                class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span
                class="special">(</span><span class="identifier">message_</span><span class="special">),</span>
        <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span
                class="special">(&amp;</span><span class="identifier">tcp_connection</span><span
                class="special">::</span><span class="identifier">handle_write</span><span
                class="special">,</span> <span class="identifier">shared_from_this</span><span
                class="special">()));</span>
  <span class="special">}</span>

<span class="keyword">private</span><span class="special">:</span>
  <span class="identifier">tcp_connection</span><span class="special">(</span><span class="identifier">asio</span><span
                class="special">::</span><span class="identifier">io_context</span><span
                class="special">&amp;</span> <span class="identifier">io_context</span><span class="special">)</span>
    <span class="special">:</span> <span class="identifier">socket_</span><span class="special">(</span><span
                class="identifier">io_context</span><span class="special">)</span>
  <span class="special">{</span>
  <span class="special">}</span>

  <span class="keyword">void</span> <span class="identifier">handle_write</span><span class="special">()</span>
  <span class="special">{</span>
  <span class="special">}</span>

  <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span
                class="identifier">socket_</span><span class="special">;</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span
                class="identifier">message_</span><span class="special">;</span>
<span class="special">};</span>

<span class="keyword">class</span> <span class="identifier">tcp_server</span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="identifier">tcp_server</span><span class="special">(</span><span class="identifier">asio</span><span
                class="special">::</span><span class="identifier">io_context</span><span
                class="special">&amp;</span> <span class="identifier">io_context</span><span class="special">)</span>
    <span class="special">:</span> <span class="identifier">io_context_</span><span class="special">(</span><span
                class="identifier">io_context</span><span class="special">),</span>
      <span class="identifier">acceptor_</span><span class="special">(</span><span
                class="identifier">io_context</span><span class="special">,</span> <span
                class="identifier">tcp</span><span class="special">::</span><span
                class="identifier">endpoint</span><span class="special">(</span><span class="identifier">tcp</span><span
                class="special">::</span><span class="identifier">v4</span><span class="special">(),</span> <span
                class="number">13</span><span class="special">))</span>
  <span class="special">{</span>
    <span class="identifier">start_accept</span><span class="special">();</span>
  <span class="special">}</span>

<span class="keyword">private</span><span class="special">:</span>
  <span class="keyword">void</span> <span class="identifier">start_accept</span><span class="special">()</span>
  <span class="special">{</span>
    <span class="identifier">tcp_connection</span><span class="special">::</span><span class="identifier">pointer</span> <span
                class="identifier">new_connection</span> <span class="special">=</span>
      <span class="identifier">tcp_connection</span><span class="special">::</span><span
                class="identifier">create</span><span class="special">(</span><span
                class="identifier">io_context_</span><span class="special">);</span>

    <span class="identifier">acceptor_</span><span class="special">.</span><span
                class="identifier">async_accept</span><span class="special">(</span><span class="identifier">new_connection</span><span
                class="special">-&gt;</span><span class="identifier">socket</span><span class="special">(),</span>
        <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span
                class="special">(&amp;</span><span class="identifier">tcp_server</span><span
                class="special">::</span><span class="identifier">handle_accept</span><span
                class="special">,</span> <span class="keyword">this</span><span class="special">,</span> <span
                class="identifier">new_connection</span><span class="special">,</span>
          <span class="identifier">asio</span><span class="special">::</span><span
                class="identifier">placeholders</span><span class="special">::</span><span
                class="identifier">error</span><span class="special">));</span>
  <span class="special">}</span>

  <span class="keyword">void</span> <span class="identifier">handle_accept</span><span class="special">(</span><span
                class="identifier">tcp_connection</span><span class="special">::</span><span
                class="identifier">pointer</span> <span class="identifier">new_connection</span><span
                class="special">,</span>
      <span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span
                class="identifier">error_code</span><span class="special">&amp;</span> <span
                class="identifier">error</span><span class="special">)</span>
  <span class="special">{</span>
    <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">error</span><span
                class="special">)</span>
    <span class="special">{</span>
      <span class="identifier">new_connection</span><span class="special">-&gt;</span><span
                class="identifier">start</span><span class="special">();</span>
    <span class="special">}</span>

    <span class="identifier">start_accept</span><span class="special">();</span>
  <span class="special">}</span>

  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span><span
                class="special">&amp;</span> <span class="identifier">io_context_</span><span class="special">;</span>
  <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">acceptor</span> <span
                class="identifier">acceptor_</span><span class="special">;</span>
<span class="special">};</span>
</pre>
    <h5>
        <a name="asio.tutorial.tutdaytime7.h2"></a>
        <span><a name="asio.tutorial.tutdaytime7.the_udp_server_class"></a></span><a class="link"
                                                                                     href="tutdaytime7.html#asio.tutorial.tutdaytime7.the_udp_server_class">The
        udp_server class</a>
    </h5>
    <p>
        Similarly, this next class is taken from the <a class="link" href="tutdaytime6.html"
                                                        title="Daytime.6 - An asynchronous UDP daytime server">previous
        tutorial step</a>.
    </p>
    <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">udp_server</span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="identifier">udp_server</span><span class="special">(</span><span class="identifier">asio</span><span
                class="special">::</span><span class="identifier">io_context</span><span
                class="special">&amp;</span> <span class="identifier">io_context</span><span class="special">)</span>
    <span class="special">:</span> <span class="identifier">socket_</span><span class="special">(</span><span
                class="identifier">io_context</span><span class="special">,</span> <span
                class="identifier">udp</span><span class="special">::</span><span
                class="identifier">endpoint</span><span class="special">(</span><span class="identifier">udp</span><span
                class="special">::</span><span class="identifier">v4</span><span class="special">(),</span> <span
                class="number">13</span><span class="special">))</span>
  <span class="special">{</span>
    <span class="identifier">start_receive</span><span class="special">();</span>
  <span class="special">}</span>

<span class="keyword">private</span><span class="special">:</span>
  <span class="keyword">void</span> <span class="identifier">start_receive</span><span class="special">()</span>
  <span class="special">{</span>
    <span class="identifier">socket_</span><span class="special">.</span><span
                class="identifier">async_receive_from</span><span class="special">(</span>
        <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span
                class="special">(</span><span class="identifier">recv_buffer_</span><span
                class="special">),</span> <span class="identifier">remote_endpoint_</span><span class="special">,</span>
        <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span
                class="special">(&amp;</span><span class="identifier">udp_server</span><span
                class="special">::</span><span class="identifier">handle_receive</span><span
                class="special">,</span> <span class="keyword">this</span><span class="special">,</span>
          <span class="identifier">asio</span><span class="special">::</span><span
                class="identifier">placeholders</span><span class="special">::</span><span
                class="identifier">error</span><span class="special">));</span>
  <span class="special">}</span>

  <span class="keyword">void</span> <span class="identifier">handle_receive</span><span class="special">(</span><span
                class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span
                class="identifier">error_code</span><span class="special">&amp;</span> <span
                class="identifier">error</span><span class="special">)</span>
  <span class="special">{</span>
    <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">error</span><span
                class="special">)</span>
    <span class="special">{</span>
      <span class="identifier">boost</span><span class="special">::</span><span
                class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">std</span><span
                class="special">::</span><span class="identifier">string</span><span class="special">&gt;</span> <span
                class="identifier">message</span><span class="special">(</span>
          <span class="keyword">new</span> <span class="identifier">std</span><span class="special">::</span><span
                class="identifier">string</span><span class="special">(</span><span class="identifier">make_daytime_string</span><span
                class="special">()));</span>

      <span class="identifier">socket_</span><span class="special">.</span><span class="identifier">async_send_to</span><span
                class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span
                class="identifier">buffer</span><span class="special">(*</span><span
                class="identifier">message</span><span class="special">),</span> <span class="identifier">remote_endpoint_</span><span
                class="special">,</span>
          <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span
                class="special">(&amp;</span><span class="identifier">udp_server</span><span
                class="special">::</span><span class="identifier">handle_send</span><span class="special">,</span> <span
                class="keyword">this</span><span class="special">,</span> <span class="identifier">message</span><span
                class="special">));</span>

      <span class="identifier">start_receive</span><span class="special">();</span>
    <span class="special">}</span>
  <span class="special">}</span>

  <span class="keyword">void</span> <span class="identifier">handle_send</span><span class="special">(</span><span
                class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span><span
                class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span
                class="identifier">string</span><span class="special">&gt;</span> <span
                class="comment">/*message*/</span><span class="special">)</span>
  <span class="special">{</span>
  <span class="special">}</span>

  <span class="identifier">udp</span><span class="special">::</span><span class="identifier">socket</span> <span
                class="identifier">socket_</span><span class="special">;</span>
  <span class="identifier">udp</span><span class="special">::</span><span class="identifier">endpoint</span> <span
                class="identifier">remote_endpoint_</span><span class="special">;</span>
  <span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span><span
                class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span
                class="number">1</span><span class="special">&gt;</span> <span
                class="identifier">recv_buffer_</span><span class="special">;</span>
<span class="special">};</span>
</pre>
    <p>
        See the <a class="link" href="tutdaytime7/src.html" title="Source listing for Daytime.7">full source listing</a>
    </p>
    <p>
        Return to the <a class="link" href="../tutorial.html" title="Tutorial">tutorial index</a>
    </p>
    <p>
        Previous: <a class="link" href="tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">Daytime.6
        - An asynchronous
        UDP daytime server</a>
    </p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%">
    <tr>
        <td align="left"></td>
        <td align="right">
            <div class="copyright-footer">Copyright © 2003-2022 Christopher M. Kohlhoff<p>
                Distributed under the Boost Software License, Version 1.0. (See accompanying
                file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
            </p>
            </div>
        </td>
    </tr>
</table>
<hr>
<div class="spirit-nav">
    <a accesskey="p" href="tutdaytime6/src.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u"
                                                                                             href="../tutorial.html"><img
        src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png"
                                                                                      alt="Home"></a><a accesskey="n"
                                                                                                        href="tutdaytime7/src.html"><img
        src="../../next.png" alt="Next"></a>
</div>
</body>
</html>
